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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6316de5d6bfbeffa6c21831921a7df5acde44744ec70ebd7ea7563e9c77e9db' 
  AND token = 'Hh74BQh3JWdXR966ebMcTuzBrYO+CBnh/1ltScHuYpc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}